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use std::mem::size_of; use test::Bencher; use rand; use rand::distributions::exponential::Exp; use rand::distributions::Sample; #[bench] fn rand_exp(b: &mut Bencher) { let mut rng = rand::weak_rng(); let mut exp = Exp::new(2.71828 * 3.14159); b.iter(|| { for _ in 0..::RAND_BENCH_N { exp.sample(&mut rng); } }); b.bytes = size_of::<f64>() as u64 * ::RAND_BENCH_N; }